Insulating-coil.



U ETiE-l) Efiliifiiii? .3%? @FEICE. I

HEEM'AITN Zl GOE, OEGHABLOTI'ENBURG, GERMANY, ASSIGHOR TO GENERAL"ELECTRIC.

' COMPANY, A. CORPORATION OF NEW YORK. 1

nisuLsTme-con.

fl '0 allzwlwvn. it may abuse-i 12..-

Beit known that I, Hm rimx Roos, a subject of the Emperor of Gernmny, residing iit Clmrlottenhnrg, Germany have-inwenttl certain new and useful,Improvements in'Insulating ceils. of which the following is a specification. V

This invention relates to the insulation of coils for electrical m airl iinesi tluise'mn'de of l'hit conductors in such coils. a clis'tincticm must be ohservetl between the insul iition' w'n'ieh separates successive turns and that; which protects the coil front ex ternal bodies; for example, the ironbody smu-o'i'mding "it. The former has to 'withstand only the small potential. difference between twofzic'ljaeent turns, but the latter must lie able to'resist the potential (lilifei-- ence between the sum of" the turns and the iron hogly oi groundi. it-is therefore nec essury to prin'iile 'u stronger insulation between the coils and ground than between adjacent turns. One mode of :iccouiplish ing this is li y placing layers of paper hetween the turnsnnd then wrapping the whole (oil with insuliting, material. Are other way of proee'ealing is to Wrap each turn completely and thencover the "whole coil with additional insulation. But in each case the external insulation must be made s iecielly and cannot be frpplied until after the intermediate insulation. Moreover, the.

outside wrapping cannot be applied by pres sure of the (roll on all sides. because the m snlnting material will inevitably bulge nnrl fillet over. This produce; air spaces whirh not only impair the. heat riulintion lint favor the formation of ozone and the development of nitrogen acids which (iiiiise n. i'leteriomti'iut-o'f the insulation.

According to the present invention, the external insuhition of lint 'ivonml coils for electrical n'uichines is pressed on all sides without bulging or folding. The intermediate layers of insulation are made broader than the conductors and are bent around the sides of the coil inU-shape. The total width of the insulation in comparison to the width of the coil is important for the applicatii'm of the process, anti is so planned in accordance with the voltage that the isntnver of the intermediate insulation cover one or more turns. and the numher of the scele-lil-ze snnerposefl overlapping parts ofiorris a insulation be tween the coil and ground.

Specification 01 Letters Ystent.

Applicsti'onflled se cmber 17.1912, Serial in. 720 185.

and especially Patented Nov. 24, 1914.

Ineceonipanying drawing-Figure l is [at cross section of a coil having the interme-I (liute insulation of each turn. in er-lapping its edges. Fig. 2 is a similar. sectihn' showing the overlapping portionsbovering-the edges of two coils, Fig. 3 shoivs such per-hi. tions ovcrh-ipping three coils, land Fig; 4; shows a eoil like Fig.1?- with. in inclosin'g wrapping. I L

"in each figure I here'representul in cross A section a coil having a plurality of turns. ot a. tint conductor l. Interposeclf'betweenj adjecent'turns ab 0, etcl is a sheet-"2 of" insulatingnntteriul. This meteri'ill nay. bet paper or other suitable insulating m nes-.11.;

-The sheets are wider than'fthe nctor' as; to form flaps 3 which are turned up at each side to cover the'edges of thum (lllCtOi'. in t the iiiiturned flzips' sire only wide enongii to eovei the edges 0; one turn of the coil, theledgeof eehflap fittiii close? against the 'ii-Xt 5' et of insuliitio n. in the flaps'on ,eztch sheet' are viileji enough to overlap not onl fthe'edges' Off) the turns lying upon that sheet but also the edges of the next turn above; while in Fig. 3 the flaps ore still'wicler and overlap two turns above the one beneath which the sheet is applied. Inv Figlagaim the sheet applied tothe uppereutermost turn k1 is wide. enough to inelosesgid turnentirely, es 4 shzmn, the edges meeting at 4:. The result of this is that the external insulation of the entire coil of the same thickness all around. In Fig. the flaps of the second turn are :n-(icle wide enouglhto overlap minuilete-ly the flaps of'the upper turn (2, thus giving a double thickness of insulation at all outside points. desirable to give extra protection tothe othenoutermost turn 11. by continuing its ad mecnt sheet of insulation-=5 entirelyeround it before epplyiug'the additional sheet (3- which affords the double thickness for its under side and edges. I

In Fig. 3 the upper turn a is protected by three thicknesses of insulation, the flaps of turns a 5 and 0 being made large enough to overlap the upper one. The lower turn it 105 has OlllZlQ insulation on onelside as in Fig. i there an additional sheet 7 applied to its m Q with flaps running up over the ecges .ne two turns next above.-

Inthis coil it is also heatim' After the coil has been protected by the bending over of the flaps of the interposed insulating sheets, it is subjected to pressure on all sides, being heated at the soutime. This not only causes the insung material to adhere to the surfaces oi the conductor, but also unites the oral iaycrs of insulating material so that a letely closed covering for'the coil is cd, and harmful air spaces are ure- 14?.- .ulinsulation, additional layers can be rapped around the coil, as shown in Fig. the first insulation forming an excellent uzndation for this extra one. The addivional layers are caused to adhere to the by the use. of adhesivecoatiugs cou nlcd with the application of heat-and. pressure ii so desired.

in accordance with the provisions of the patent statutcs, I have described the principie of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof; hot I desire to have it understood that the u* })&1&tu8 shown is only illustrative, and tlat the invention can be carried out by other means.

shling ot a plurality of turns of a flat con- Iif it desired to have a still thimrer ductor and sheets of insulation interposed between said turns, each sheet being wide enough to formflaps which will cover the edges of adjacent turns, the sheet between the two uppermost turns being wide enough to completely inclosc the upper turn.

A coil for an electrical machine, consisting of a plurality of turns of a flat conductor, and sheets of insulation interposed.

between said-turns, each sheet being wide enough to form,flaps to turn up and cover the edges of said turns; the sheets adjacent to the outermost turns being also wide cnough to completely inclose said turns.

A coil for an elcctrical machine consisting of a plurality of turns of a flat conductor and sheets of insulation interposed betwcensaid turns, each sheet being wide enough to form flaps to turn up and cover the edges oil said turns, the sheets adjacent to the uppermost turns being wide enough to completely inclose said turns, and additional insulation covering the turns at the lower end of the coil to the same thickness as the overlap mg sheets at the upper end.

I n witness whereof, I have hereunto set my hand.

I HERMANN ROOS.

Witnesses:

Enrol-I UBERLfiE, Tuuooou Slinmo. 

